Sanic
High-performance async Python web framework powered by uvloop, offering decorator-based routing, Blueprints for modular route organization, signals, and built-in HTTPS support.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Built-in TLS support via ssl parameter in app.run(). No built-in CSRF or auth. uvloop dependency is well-audited. Review extension dependencies separately.
⚡ Reliability
Best When
You need decorator-style async routing with uvloop performance benefits, Blueprint-based modular organization, and built-in WebSocket support in a single library.
Avoid When
You need automatic request/response schema validation and OpenAPI generation, or you are deploying on Windows where uvloop is unavailable.
Use Cases
- • Building async agent-facing REST APIs where uvloop's throughput advantage over the default event loop matters at scale
- • Organizing large agent orchestration APIs into modular Blueprints that map to distinct agent capability domains
- • Implementing WebSocket endpoints for real-time bidirectional agent communication with built-in server support
- • Running background tasks that process agent job queues asynchronously without blocking the request handler
- • Deploying self-contained agent microservices with built-in HTTPS (no reverse proxy required) using Sanic's TLS support
Not For
- • Teams prioritizing automatic OpenAPI docs and Pydantic request validation over raw performance (use FastAPI)
- • Environments where uvloop cannot be installed (Windows, certain constrained containers)
- • Simple scripts or prototypes where Sanic's async-first model adds unnecessary complexity
Interface
Authentication
No built-in auth — authentication implemented via Sanic middleware or signals.
Pricing
Open source MIT.
Agent Metadata
Known Gotchas
- ⚠ uvloop is not available on Windows; agents running in Windows containers fall back to the default asyncio loop silently without error
- ⚠ Sanic's worker model uses multiprocessing by default — shared in-process state (e.g., agent context caches) is not shared across workers
- ⚠ Blueprint URL prefix conflicts produce routing errors that are only detected at startup, not during development imports
- ⚠ The signals system (app.signal / @app.signal) has different lifecycle semantics from middleware and is easy to confuse with it
- ⚠ ASGI mode disables Sanic's built-in server features (workers, reload, inspector) — agent deployments must choose one mode consistently
Alternatives
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Scores are editorial opinions as of 2026-03-07.